Eric h



(No Model.)

7 E211. ODERMAN.

PUMP

Patented Mar. 15, 1898.

WITNESSES ing against the outer side of the disk b.

ERIC H. ODERMAN, OF WAYNESBOROUGH, PENNSYLVANIA, ASSIGNOR TO THE FRICKCOMPANY, OF SAME PLACE.

PUMP.

SPECIFICATION forming part of Letters Patent No. 600,841, dated March15, 1898.

Application filed April 19, 1897.

To aZZ whom it may concern.-

Be it known that I, ERIC H. ODERMAN, a eitizen of the United States,residing at Waynesborough, in the county of Franklin and State ofPennsylvania, have invented certain new and useful Improvements inPumps; and I ,do hereby declare the following to be a full,

clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to pumps; and it consists in the novelconstruction and combination of the parts hereinafter fully describedand claimed.

In the drawing the figure is a sectional plan view of the pump and itsvalves.

This pump is used for air or water or any otherfluid or liquid.

A is the pump-cylinder, and B is its piston. The piston may be of anyapproved construction, but ayieldable piston is preferably used.

B is the piston-rod, which is rigidly secured to the disk I).

O is a cylindrical cup which forms the yieldable portion of the pistonB.

O is a ring secured to the cup 0 and bear: A spring 0 is interposedbetween the disk 19 and the bottom of the cup 0, and c is a projectionon the cup which is slidable in a guide I) on the disk I). The piston isprovided with any approved packing, such as rings. Whenever the pistonin its outer stroke strikes an obstruction, such as the end of thecylinder, the spring. yields so that the cylinder and piston are notinjured or broken by the concussion. A pump provided with a yieldablepiston in this manner can work without the clearance at the end of thepump-cylinder which is usually requisite.

. D is the delivery-valve of the pump. The

seat d of this valve is on the end of the cylinder A, and the valvecovers the bore of the cylinder. The stem d of the valve is tubular andslides in a guide 6, projecting from the cover-plate E,which is securedto the cylinder. The guide 6 projects within the valve-chamber e, andthe stem cl of the delivery-valve is provided with packing, such as therings f, so that nothing can leak past it. A flange Serial N5. 632,827.(No model.)

f is provided on the periphery of the valve D and slides over a flange Fon the guide 6, so that a small chamber 9 is formed between the valveand the front end of the guide e..

The guide 9 forms a stop which prevents the valve D from being forcedtoo far away from its seat, and the presence of fluid in the cham ber gprevents the valve from moving too suddenly.

G is the inlet or suction valve, which. closes the tubular stem at ofthe delivery-valve and rests on a seat 9 at the front end of the saidvalve next to the piston. The stem H of the valve G is slidable in aguide 7?. in the valvestem (1, and h is a disk which is secured on theend portion of the stem H and is provided with means for adjusting itsposition longitudinally, such as the nut is.

H is a short cylinder carried by the stem 01, leaving passages z'forfluid'to pass through the stem. The disk h is slidable inthe cylinder H,and its hub t" is slidable in a hole in the bottom of the cylinder H.

I is a spring which is interposed between the hub i and the guide h, andwhich operates to close the suction-valve or to assist in closing it.

The bottom of the cylinder H forms a stop for the disk h to strikeagainst, so that the suction-valve cannot move too far away from itsseat, and the presence of fluid in the cylinder H prevents the movementsof the valve from being too sudden.

The cover-plate E is provided with a chamberj, the bottom end of whichis closed by a cap J. A spring j is interposed between the cap J and theend of the valve-stem d, so that the valve D is pressed onto its seat.

K is the suction pipe or passage which com municates with the chamber j,and K is the delivery pipe or'passage which communicates with thechamber e. The action of the suction and delivery valves is similar tothose ordinarily used; but the peculiar construction of the valveshereinbefore described, together with the yieldable piston, enables thepump to Work without any clearance in its cylinder and without danger ofbreakage by reason of the piston striking the end or cover of thecylinder.

When the yieldablcpiston is moved toward the valve D, the contents ofthe cylinder are compressed until the resistance of the spring j isovercome; but the piston does not yield because the tension of thespring j is less than that of the spring 0. The contents of the cylinderare forced through the valve D until the piston comes in contact withthe said valve and the piston then yields slightly. When the pistonmoves in the reverse direction, the valve D is moved forward in contactwith it by the spring j, so that the combined action of thespring-pressed valve and the yieldable piston operates to prevent any ofthe contents of the cylinder which have been forced out of it fromrentering it While the valve is closing.

What I claim is- 1. The combination, with a piston-rod, of a yieldablepiston comprising a disk rigidly secured to the piston-rod and providedwith a central guide, a cup in which the said disk is slidable, said cupbeing provided with a central projection slidable in the said guide, aringretaining the disk in the cup, and a spring encircling the saidguideand projection and pressing the said disk against the said ring,substantially as set forth.

2. The combination, with a pump-cylinder provided with a valve-seat onits end, of a delivery-valve bearing on the said seat and provided witha tubular stem having an internal guide It, a brake-cylinder H at itsrear end, and a suction-valve seat at its front end; a suction-valveprovided with a stem slidable in the said guide, a disk h secured on thesaid stem and provided with a hub 1) slidable in a hole in the bottom ofthe said brake-cylinder, and a spring interposed between the said huband the guide h, substantially as set forth.

3. The combination, with a pump-cylinder having a valve-chamber at itsend, of a plate closing the said valve-chamber and provided with a guideprojecting within it and having a flange at its front end, and adelivery-valve seated on the end of the said cylinder and provided witha stem slidable in the said guide, and having a peripheral flangeslidable over the said flange on the guide, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

ERIC I-I. ODERMAN.

Witnesses:

WILL. A. HARBAUGH, M. F. NEWMAN.

